Burglar-alarm.



PATENTED MAR. 15, 1904.

N. A. LYLE.

BURGLAR ALARM. APPLICATION FILED APR.- 11. 1903.

N0 MODEL.

Iilllf t will nia cams PEYCRS co. mormurum, WASHINGTON, n. c.

UNITED STATES Patented March 15, 1904.

PATENT OFFICE.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent N0. 754,470, dated March 15, 1904.

Application filed 'ipril 11, 1903.

To all whom; it may concern.-

Be it known that I, NATHAN A. LYLE, acitizen of the United States, residing at Kremlin, in the county of Garfield and Territory of Oklahoma, have invented certain new and useful Improvements in Portable Burglar-Alarms, of which the following is a specification.

I attain this object by the use of compressed air, a whistle, and other mechanism illustrated in the accompanying drawings, in which Figure 1 illustrates the interior of a bank. Fig. 2 is-a perspective view of the entire machine. Fig. 3 is an enlarged detail view of portions of said machine. Fig. 4is an air-receivlng cock and check-valve. Figs. 5, 6, 7 and 8 are details of said cock and valve.

Similar characters refer to similar parts through out the several views.

My reservoir is built sufliciently strong to sustain two hundred pounds pressure. EX- tending from the top of said reservoir D, Fig. 3, is a pipe E, to which is attached a pressuregage a, valve 2, and whistle F. From pipe E extends an arm G approximating an angle of forty-five degrees, and pivotally secured to the outer end thereof is a rod H, extending downward. Attached to valve 2 is an arm3, having a weight W adjustably secured thereto near its outer end, which end is adapted to be seated upon projection on teeth J on the rod H.

The air-receiving cock, Fig. 4, is provided with threads M to screw into reservoir D at 5, Fig. 2. A bore 6 6 one-eighth of an inch in diameter extends about half-way through said cock and leading into a large bore 7, ex tending to the outer end of said cock. A rubber disk 13, to which is attached a spindle 11 and a spiral spring 10, Fig. 5, and is placed in said larger bore with the disk on the end Serial No. 152,276. (No model. I

of the bore 6 6, which forms a complete valveand stop. A perforated cap R, Fig. 8, is placed over the end of the cock 4, which cap comes in contact with said spiral spring, and thusassures its position. On the periphery of said disk are depressions S S S. When an air-pump is placed on the end of the cock, Fig. 4, and air is forced into the bore 6 6, it will force the check-valve, Fig. 6, back from the small bore and air will pass through the depres'sions S S S and through the perforations 12, Fig. .8, and into the reservoir D. When the desired pressure is secured in the reservoir, the end of the arm 3 is set on tooth J. Fine silk thread T T T are secured to the lower end of the trip-rod H and are carried to different parts of the building and attached to any object desired. The machine is then ready for the reception of a burglar. burglar comes in contact with said thread, it will jerk the trip-rod H, spring the trigger J and cause the arm 3 to drop down, which opens the discharge-valve 2 and allows the When said compressed air to escape into the whistle and p 

